// 清除默认样式
* {
	padding: 0;
	margin: 0;
	box-sizing: border-box;
	letter-spacing: 1px;
}
html {
	font-size: 15px;
	font-family: Helvetica, Arial, sans-serif;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
	scroll-behavior: smooth;
}
